Abstract

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Title:: Study on Resilience Models of Circular Four-tube Concrete-filled Steel Tubular Laced Columns

Author(s):: CHEN Bo-wang; ZOU Yan-hua; TANG Chu; LUO Yao; LI Pin; DANG Xiao-bing; College of Civil Engineering and Mechanics，Central South University of Forestry and Technology

Keywords:: concrete-filled steel tubular laced column; resilience model; axial compression ratio; equivalent slenderness ratio; material proportion coefficient; skeleton curve; hysteretic rule

Abstract:: In order to explore elasticplastic seismic response with the aim of component nonlinear theoretical analysis of concretefilled steel tubular laced column, two circular fourtube concretefilled steel tubular laced columns were tested under low cyclic load, and the experimental results of twelve circular fourtube concretefilled steel tubular laced columns under low cyclic load were collected. The degeneration threeline resilience models of concretefilled steel tubular laced column was proposed through theory analysis and regression analysis of test results. The relationships between the model and the main parameters, such as axial compression ratio, equivalent slenderness ratio, material proportion coefficient, were established. Comparative analysis of the calculation results of model and the experimental curves was carried out. The result show that calculation results agree well with experimental results, and the calculation method of resilience model is simple. The resilience model proposed can be conveniently applied in structure seismic response analysis and engineering application.